Reanalysis comparisons of upper tropospheric/lower stratospheric jets and multiple tropopauses

摘要: Abstract. The representation of upper tropospheric–lower stratospheric (UTLS) jet and tropopause characteristics is compared in five modern high-resolution reanalyses for 1980 through 2014. Climatologies tropospheric jet, subvortex (the lowermost part the vortex), multiple frequency distributions MERRA (Modern-Era Retrospective analysis Research Applications), ERA-I (ERA-Interim; European Centre Medium-Range Weather Forecasts, ECMWF, interim reanalysis), JRA-55 Japanese 55-year Reanalysis), CFSR Climate Forecast System Reanalysis) are with those MERRA-2. Differences between alternate products from individual reanalysis systems assessed; particular, a comparison data on model pressure levels highlights importance vertical grid spacing. Most differences UTLS jets tropopauses consistent assimilation grids resolution – example, (with coarsest native horizontal resolution) typically shows significant low bias respect to MERRA-2, more modest one, while finest high MERRA-2 both tropopauses. Vertical temperature structure spacing especially important characterizations. Substantial seen mid- high-latitude Southern Hemisphere (SH) winter as well associated tropical circulations during solstice seasons; some largest other same times places. Very good qualitative agreement among large-scale climatological features distributions. Quantitative may, however, have consequences transport variability studies. Our results highlight considering studies, relation grids; this particularly critical when using an observational reference evaluating global chemistry–climate models.